package com.ruoyi.gateway.config;

import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.config.ResourceHandlerRegistry;
import org.springframework.web.reactive.config.WebFluxConfigurer;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

/**
 * 聚合系统接口
 *
 * @author ruoyi
 */
@Component
public class SwaggerProvider implements SwaggerResourcesProvider, WebFluxConfigurer {
  /** Swagger2默认的url后缀 */
  public static final String SWAGGER2URL = "/v2/api-docs";
  /** 网关路由 */
  @Autowired private RouteLocator routeLocator;

  @Autowired private GatewayProperties gatewayProperties;

  /**
   * 聚合其他服务接口
   *
   * @return
   */
  @Override
  public List<SwaggerResource> get() {
    List<SwaggerResource> resourceList = new ArrayList<>();
    List<String> routes = new ArrayList<>();
    // 获取网关中配置的route
    routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
    gatewayProperties.getRoutes().stream()
        .filter(routeDefinition -> routes.contains(routeDefinition.getId()))
        .forEach(
            routeDefinition ->
                routeDefinition.getPredicates().stream()
                    .filter(
                        predicateDefinition ->
                            "Path".equalsIgnoreCase(predicateDefinition.getName()))
                    .filter(
                        predicateDefinition ->
                            !"ruoyi-auth".equalsIgnoreCase(routeDefinition.getId()))
                    .forEach(
                        predicateDefinition ->
                            resourceList.add(
                                swaggerResource(
                                    routeDefinition.getId(),
                                    predicateDefinition
                                        .getArgs()
                                        .get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                        .replace("/**", SWAGGER2URL)))));
    return resourceList;
  }

  private SwaggerResource swaggerResource(String name, String location) {
    SwaggerResource swaggerResource = new SwaggerResource();
    swaggerResource.setName(name);
    swaggerResource.setLocation(location);
    swaggerResource.setSwaggerVersion("2.0");
    return swaggerResource;
  }

  @Override
  public void addResourceHandlers(ResourceHandlerRegistry registry) {
    /** swagger-ui 地址 */
    registry
        .addResourceHandler("/swagger-ui/**")
        .addResourceLocations("classpath:/META-INF/resources/webjars/springfox-swagger-ui/");
  }
}
